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Proceedings Paper

Spontaneous chirality in an octupolar discotic crystal
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Paper Abstract

In the quest for organic second-order nonlinear materials, self-assembled structures based on octupolar molecules have shown to be promising candidates. The presented work focuses on an octupolar substituted 1,3,5-trisalkynylbenzene that forms crystals that show significant second-harmonic generation (SHG). Continuous polarization SHG measurements were performed to elucidate the tensorial nature of this response. Unfortunately the model at hand was unable to fit the polarization patterns due to depolarization of the second harmonic beam caused by multiple scattering in the sample. Although the chromophore is clearly achiral, these patterns revealed a different response for left and right circularly polarized light, also known as SHG circular difference. This implies that these molecules spontaneously assemble in chiral superstructures. These surprising results were confirmed by circular dichroism spectroscopy, revealing a monosignate CD band that must be attributed to a supramolecular chiral organization.

Paper Details

Date Published: 19 September 2011
PDF: 7 pages
Proc. SPIE 8113, Linear and Nonlinear Optics of Organic Materials XI, 81130F (19 September 2011); doi: 10.1117/12.893488
Show Author Affiliations
Stijn J. Van Cleuvenbergen, Katholieke Univ. Leuven (Belgium)
Monique A. Van der Veen, Katholieke Univ. Leuven (Belgium)
Inge Asselberghs, Katholieke Univ. Leuven (Belgium)
Gunther Hennrich, Univ. Autónoma de Madrid (Spain)
Thierry Verbiest, Katholieke Univ. Leuven (Belgium)
Koen Clays, Katholieke Univ. Leuven (Belgium)

Published in SPIE Proceedings Vol. 8113:
Linear and Nonlinear Optics of Organic Materials XI
Jean-Michel Nunzi; Rachel Jakubiak; Theodore G. Goodson III; Manfred Eich, Editor(s)

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